Stop nut



Dec. 19, @344. 5 BLQQMFIELD 2,365,3@0

' STOP NUT 7 Filed Sept. 10, 1943 Q (a I Z INVENTOR.

fiwm/e/ fi/aamf/e/d 14 TTO/QNEK Patented Dec. 19, 1944 UNITED STATES PATENT OFFICE Samuel nicfi flsfwfcmm, Kane.

Application September 10, 1943, Serial No. 501,829 (01. 151-7) 9 Claims.

This invention relates to self-aillxing. nuts for machine bolts or the like, conventionally designated in the trade as stop nuts, and has for its primary object, the provision of a unit of that character that has as a component part thereof. a removable, rigid, fibrous element capable of having threads formed therein as the threaded body of the nut is moved to the operative position.

Another important aim of this invention is to provide a stop nut with a fibrous, renewable collar, capable of maintaining the nut body against accidental displacement after the threads are formed in said collar.

Other objects of the invention include the provision of a specially formed nut body, capable of holding a fibrous collar in the operative position, which collar has an anti-friction portion thereon, and detents cooperable with structure on said body to prevent relative movement of the body and collar as the assembly is manipulated to the operative location on the bolt.

A yet further aim of this invention is to provide a stop nut, the body whereof carries means for removably holding a fibrous collar, which collar may be renewed when the nut is free of the bolt with which it is designed to cooperate.

Specific structural details and the manner of associating the parts of the stop nut comprise further salient objects of the invention, all of which will appear during the course of the following specification, referring to the accompanying drawing, wherein:

Fig. l. is a top plan view of a stop nut madein accordance with the present invention.

Fig. 2 is a side elevational view of the same.

Fig. 3 is a transverse cross sectional view through the stop nut, showing the same'iri combination with a conventional bolt.

Fig. i is a sectional view .through the stop nut taken on line IV--IV of Fig. 3, looking in the direction of the arrows.

Fig. 5 is a sectional view taken on line VV of Fig. 2, looking in the direction'of the arrows.

' Fig. 6 is a view similar to Fig. 3, but with the stopriut forced to a place on'the conventional bolt where threads have been cut in the fibrous collar; and

Fig. 7 is a cross sectional view through ailbrous collar made in accordance with a moth-- fiedform of the invention.

It has heretofore been the practice to employ stop nuts having resilient inserts, the character whereof precludes replacement. The resilient incert is not placeable by the operator andthe nuts,

therefore, are replaceable only at relatively great expense.

The stop nut illustrated in the accompanying drawing may be used repeatedly merely by replacing the fibrous collar that is held in the operative position in an unique manner, permitting such replacement by the mechanic.

The body Ill of the nut has an outer periphery of conventional contour, soiar as the ring-engaging outer surface thereof is concerned. The hexagonal form of nut illustrated, is in common use but it is understood that any form of nut body may be made to support the hereinafter more fully described fibrous collar i2.

Body Ill of the nut has a threaded opening [4 therethrough to receive a conventional bolt Hi. A skirt i B of semi-circular character partially circumscribes threaded opening M and projects laterally from one end of body it.

Skirt ill terminates at faces spaced apart a distance very slightly less than the outside diameter of collar it. The inside diameter of skirt is is slightly greater than the outside diameter till of collar it, but the distance between faces 20 is less than the outside diameter of i2, and therefore, when said collar is moved to position between faces Zt, slight pressure'is all that is needed, after which the collar will remain in place.

A bead 22 interconnects faces 20 and cooperates with skirt ill in establishing a shallow cavity it in one end of body it to receive collar l2. Skirt it and bead it forms circular wall concentric with the outer annular face of collar l2, and after said collar i2 is moved to the operative position, flange it will overhang a portion thereoi, as indicated in the drawing.

Flange Ed is commensurate in length with skirt it and projects radially inwardly therefrom to an arcuate face 28 spaced outwardly from the inner face till 012 collar it, which forms opening s2 through this fibrous element of the assembly,

A plurality of detents it formed in flange 26 may be stamped or otherwise created to engage cooperating openings 36 of any desirable form provided on the face of collar 32. The opposite face of collar it carries an annulus 33 in the nature of a wire ring to establish a frictionless line contact between collar l2 and the face of nut body it at the bottom of cavity 24. This line contact circumscribes threaded opening it and is substantially concentric with the axis of the enthe assembly.

The space between the innermost part of detents M and this said face of body ill at the bottom of cavity 24, is very slightly greater than the collar it and i2 respectively cannot occur. This m is due to the inter-engagement between detects 36 and openings 86.

As .threods ere being cut in the rigid, fibrous material from which collar 02 is mode, collar :12

will assume the position shown in Fig. 6, but in 15 the event body iii of the nut attempts to move from its desired position on bolt i6, annulus 88 will engage the face of nut to to oppose such action.

When the assembly, illustrotedend described above, is removed from bolt 66, a new collar 82 -may be placed upon removal of the used collar without destroying in cnywise the effectiveness of nut body it). When theessembly is removed spouses and e. shallow cavity wit shirt'to retm sold collar.

3. A stop nut comp e body having as threaded opening therethrough; on axially projecting skirt on the body; on over r. g flange on the skirt; a, fibrous collar carried by the skirt; and detents formed on the collar and flange to prevent relative rotation of the body and collar when the nut is being moved to position on a bolt, said skirt being formed to permit removal of the collar from the operative position when the nut is disengaged from the bolt.

4. A stop nut comprising as body having o. threaded opening therethrough; o. chamber formed in the body; a. fiber collar in the climber having a. smooth inner nnnulor surface substantiolly the same diameter as the crest eter of the threads in said threaded opening said ch her having a side opening for entrance of. the collor into the chamber, the width of sold opening being slightly'iess than the'wldth oi the collar to require e. small amount oi pressure for forcing the collar into said chamber; and means to: preventing relative movement of the body and sold from s. bolt, collar 62 is destroyed without sheet ing the threads in opening fi l otborly Another form or collar that may he empioyed'is illustrated in Fig. '2. This modifiediorm of colier tilt includes the openings 802 but in lieu oi ennulus 38 to establish the line contact, the inner since oi collar loo isiormed to present the one line of contact at edge 983. The material irom which collar 5! is produced should be rigid, fibrous substance, the some as wed in making collar 02, for this material is capable of having threads out therein by e. bolt such as i6, yet strong enough to create the desired amount of friction between the feces of the threads on bolt 66 and on body 08 to preclude cccidentol displacement.

in using-sppiicents device on insert it? is .iorcibly inserted through the entronce between face 26 into the cavity in nut to end when so inserted i2 lies loosely on the bottom of sold cavity and loosely therein with its bore 39 substantially in line with i l of nut iii. A bolt 86 is now screwed into were shown in Fig. 3 and easily enters 06 until it encounters the bore in 62. When Miencounters it the some is raised thereby so that detent s 86 end opening 86 interengege and iEur- 5Q ther relative rotation between 92 and i0 ceoses and to impresses its threads into (12 end there is i great frictional grip of 02 on 06. It now it starts to unscrew the nut it] comes into contact with'it or 89 3 and since these present little friction on 5 ters Patent is:

' 1. A stop nut comprising e. body having :2. threaded opening therethrough; on axially projecting skirt on the body; and e. fibrous collar an entrance opening for the collar in radial relation to the axis of the nut.

2. A. stop nut comprising o. body having o threaded'openlng therethrough; an a prolooting shit on the-body; afibrous collar carried by the skirt; and detents formed on" the collar and body to prevent relative rotation'oi the body and ,collar when the nut is being moved to position on a bolt, said skirt having epordon thereoi" claimed as new and. desired to be secured by Letg coilor as the nut is moved to position on a bolt.

5. A stop nut for bolts of conventional cheer-m= ter comprising e. body having a threaded opening therethrough; and e fibrous collar removobly mounted on the bodv, the inside race of the collar being smooth, concentric with the inside threaded face oi the opening of the nut body and substantioily the some diameter as the crest diameter oi said threaded opening; and an annulus portly embedded in said inside face of the co or to provide on anti-friction late for engagement with proximal face of the body.

6. A stop nut r'or bolts of conventional chemo ter comprising o body having or threaded opening therethrough; e. fibrous collar removnbly mounted on the body, the inside fnce oi the collar smooth, concentric with the inside threaded face of the opening of the nut body and substantially the same diameter as the crest diameter of threoded opening, snidbody having on overh Q ing flange provided with detents; end redial grooves in the collar for engaging said detents to prevent relative movement of the body and collar about the axis of the nut.

7. A stop not for bolts of conventional choreoter comprising a body having e. threaded opening therethrough; e. fibrous collar removnbly mounted on the body, the inside face of the collar being smooth, concentric with the inside threaded face of the opening of-the nut body and substantially the some crest diameter of sold diameter of the threaded opening; detents on the body and collar preventing relative movement thereof obout'the axis of the nut; and structure on the collar presenting e. line contact between the collar and body, said line contact being in clrcumscribing 7 relation with the openings of the body and collor and concentric with the axes thereof.

8. A stop nut for bolts of conventional choreo- 4 'removably carried by the shirt, said skirt having 5 comprising a body having a threaded opening therethrough; a recess i'ormed in the body and circumscribing the opening at one side of the body; e collar of rigid fibrous material confined within the recesswith-the inside wall thereof sub: stantially in allgnment with the inner-edges of the threads of the body Opening; detents on the bodyend said collar to prevent relative movement 01' the body and collar about the axis o! the bolt when the body is being moved to theoperotive position end as threads are being cut in the inner" cut away to tom a side entrenoetor the 9911 3 face of the collar; and nnanti-frictioniece-oi to the axis of the nut, said opening being smaller in width than the diameter of the collar which passes therethrough whereby slight pressure is required to insert the collar which is then retained 5 in the opening.

SAMUEL BLOOMFI'ELD. 

